Abstract: ITo deal with the problems of ultra-long distance and large dynamic communication under a maximum distance of 400 million kilometers of Tianwen-1 Mars Orbiter, the TT&C and data transmission communication system of Tianwen-1 Mars Orbiter realized high-sensitivity acquisition of -156dbm weak signals and adaptive data transmission and reception under large dynamic conditions through integrated TT&C and data transmission technology of multi-antenna beam shaping, multi bit rate adaptive transmission and reception processing technology, high-sensitivity signal acquisition technology, electromagnetic interference suppression technology under ultra-high sensitivity and high-precision stable pointing technology of large aperture antenna under extremely low temperatures. Except for celestial block, the whole process was 100% covered by the earth communication link and beam, and data transmission rate to the earth was up to 1Mbps at the farthest distance of 400 million kilometers. This technology has been examined and verified in Tianwen-1 Mars exploration mission, and can provide reference for the design and on-orbit work of the TT&C data transmission communication system in subsequent deep space exploration missions.